Steam-pump.



No. 650,075. Patented May 22,` |900.

A. ELLiS. l

STEAM PUMP` (Application filed Mar. 19, 1900.)

(No Model.)

NITED STATES PATENT OFFICE.

ABRAM ELLIS, OF AUGUSTA, GEORGIA.

STEAM-PUM P.

SPECIFICATION formngpartof Letters Patent No. 650,075, dated May 22, 1900. Application nea nach 19, 1900. serial No. 9,311. cio-moan.)

In most reciprocating steam-engines the.

piston movement must be to the same distance with every stroke 5 but there are many pumps in which a shorter or a longer stroke may be made, with the only dilerence in result that less water is lifted by a short stroke than by along one. It thus becomes desirable to have a changeable stroke, so that the full power of the engine may be applied to the movement of the pump-piston a short distance should the resistance be great, or a full stroke of the pump-piston may be made when the .resistance is such as to permit the maximum quantity of water to be lifted by the pump.

Figure l of the drawings isa plan, and Fig. 2 a side elevation, of a steam-pump according to the principles of the present invention.

A indicates the steam-cylinder, to which steam is supplied in any suitable manner through steam-chest B, the valve therein being controlled by usual connections from the crank-shaft, as indicated at C. The pistonrod D of the steam-cylinder is connected to a cross-head E, which slides on guideways F F. A rock-shaft or spreader G extends through the cross-head E, and to the ends of this spreader G two pitman-bars I-I are connected. The pitman-bars H are connected near the other end of the steam-cylinder bya couplingbar I, which in turn is connected to the crank K of crank-shaft L, said crank-shaft being supported in usual bearings, as M. At each end of crank K a disk O is attached to said crank, and these disks are of course rotated as the pitman-bars reciprocate. It is not very material whether spreader G rocks in the cross-head E or Whether the spreader be fixed and the pitman-bars rock thereon.

The disks or fly-wheels O will be driven by the reciprocation of the piston-rod D through the mechanism described. VThe disks O vare slotted, and in the slots O wrist-pins P P may be adjusted at any distance from the center by means of nuts or usual fastening devices. To these crank-pins P pitman-rods Q Q are connected, both leading to a spreader R, which passes through a cross -head S, this cross-head being guided on the slideways F F. The cross-head S is connected to a pumprod T, so that the rotation of disks O reciprocates spreader R and cross-head S, and the length of this reciprocating movement is determined by the position of the wrist-pins P in the slots O'.

The pump-cylinder W is of usual construction, the valves operating to cut O and supply the liquid thereto in usual manner.

The valve-controlling mechanism C may be located in any convenient position, so that eccentrics on the shaft will control the move-- ment of the slide-valve.

From the above description it is thought the general principles of my invention will be well understood. The reciprocation of the steam-piston is uniform as to distance, and the connections from such piston serve to rotate the disks or fly-wheels O. These fiy-wheels,bein g at opposite ends of the crankshaft, give convenient means for attachment of the long pitman-bars Q Q and are in position to balance the crank, or very nearly so.

vThe adjustment of Wrist-pins P may be according to the desired stroke of the pump, and by setting the cross-head S to a desired position and loosening the fastenings of the Wrist-pins these pins will find their proper positions in slots O' and may be there secured in such manner asto cause any desired throw of the pump-piston within the limits of the capacity for adjustment determined by the length of slots O.

I do not limit my claims to the precise construction of parts, as it is understood that the substitution of equivalents does not change the nature of the invention.

l. In a steam-pump, the combination of a steam-cylinder, piston-rod, and cross-head, a pitman from said cross-head to a crank-shaft, and a slotted disk on said crank-shaft and a wrist-pin therein, and a pitman connected to IOO 2 f l l 650,075

said wrist-Qin and toacross-.head moving on a slideway and connected to a pump-piston, all the specied elements and their necessary cooperating adjuncts combined substantially as described. Y

2. In a steam-pump, the combination of a steam cylinder, pistonrod and cross head. moving on Ways, a second cross-head moving on the saine Ways and connected to apumpplston, and means connecting the cross-heads by which the uniform throw of the steam-pis.my

ton may be changed togive adifferentthrowto...

the pump-piston, substantially as described.l

I'nectedk to 'eachoffsaid Wrist -pins and to a 3. In a steam-pump, thel combinatiorllofaI steam-cylinder and its piston-rod, pitman connection from said piston-rod-past the cylinder tol aK crank-shaft, an adjustable connectionfrom said crank-shaft toa'second pitman,

andapumprod operated by said second pitf Witnesses:

man; substantially as described.

4. In'a steam-pump, the steam-cylinderand y piston-rod, across-head connected to said pisyin presence of two witnesses;

y gaged by said couplin g-bar, and an adjustable Wrist-pin on the crank-shaft connected by secfond pitman to apump-rod, substantially as described.

Y Inasteamfpump,thesteam-cylinder,pis ton-rod, and connections substantlally as described to a crank-shaft, a face-plate at each 'Mend of said crank-shaft, and aradially-adjustable Wrist-pinfthereon', and pitman-bars consp-reader. attached to a pump-rod, all

bined substantially as described. In testimony whereof I aix my Signat-nre ABRAM? ELLIS.

STEWART THINIZY, A. S. MORRIS. 

